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Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 147,876 $ 140,153 $ 449,512 $ 227,552
Change in debt securities available-for-sale:        
Unrealized holding gains (losses) for the period (208,626) (285,798) (304,061) (1,019,782)
Reclassification for securities transferred to held-to-maturity 0 0 0 165,473
Reclassification adjustment for securities (gains) losses realized in income 241 172 5,440 (85)
Income tax effect 51,903 68,356 83,092 202,999
Unrealized gains (losses) on available-for-sale securities (156,482) (217,270) (215,529) (651,395)
Change in securities held-to-maturity:        
Adjustment for securities transferred from available-for-sale 0 0 0 (165,473)
Amortization of unrealized losses on securities transferred     from available-for-sale 5,623 6,772 16,574 10,774
Income tax effect (1,430) (1,651) (2,861) 37,621
Changes from securities held-to-maturity 4,193 5,121 13,713 (117,078)
Change in hedges:        
Net unrealized derivative gains (losses) on hedges (15,574) (36,755) 45,547 (49,679)
Reclassification adjustment for (gains) losses realized in net income 4,927 749 (19,893) (139)
Income tax effect 2,754 8,846 (6,094) 12,240
Changes from hedges (7,893) (27,160) 19,560 (37,578)
Change in defined benefit pension plans:        
Amortization of net (gains) losses recognized in income 0 (11) (182) (32)
Income tax effect 0 3 45 8
Changes from defined benefit pension plans 0 (8) (137) (24)
Other comprehensive income (loss), net of tax (160,182) (239,317) (182,393) (806,075)
Comprehensive income (loss) $ (12,306) $ (99,164) $ 267,119 $ (578,523)